Originally posted by rawr Yep. I got an early pair, and it's pretty surprising that they transmit
*all* P-TTL information over pretty long distances. Not only is the P-TTL exactly like having a flash on a cable (flash comp, etc.), but the flash head zooms with the lens, the AF assist light comes on in low light, and naturally HSS mode on the flash allows up to 1/8000 exposures.
The downside is that right now they only work with the AF-540FGZ II and 360 II, but not with the older Pentax flashes, and other Mfr's P-TTL flashes. Further, they don't work with every Pentax camera out there.
Naturally to test them out, I went to visit the Ricoh Imaging Canada office, and together we tried out a slew of current models. My K-5 works very well (again with the 540 II) but my K-3 requires some wiggling in the hot shoe. The new K-3II doesn't work at all, nor does the K-S2, and the K-S1 and Q-S1 only fire at full power. The Q7 works well, though, so it's probably something to do with the version of the camera, almost as if Pentax P-TTL is a moving target.
I'm working with the developers to improve the firmware so they will be "production ready" for all cameras and flashes old and new. In the meanwhile, here is an example image (of our local Pentax rep) shot from a 645Z at 1/4000 with the AF-540FGZII off camera. I'd also recommend getting a pair if you have some patience for trying things out.
Any doubters can download the full image
from this link here.